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    • 7. 发明授权
    • Electronic electricity meters
    • 电子电表
    • US4931725A
    • 1990-06-05
    • US131061
    • 1987-12-10
    • Peter R. HuttStephen Day
    • Peter R. HuttStephen Day
    • G01R21/133H03M1/00
    • G01R21/133
    • Apparatus whose measurement means consists solely of electronic components, measures the power taken by an electrical load connected to an alternating source of electricity supply in such a manner that the power sensed or energy accumulated is in agreement with the same measurements as performed by a conventional rotating disc electromechanical meter. Fundamental frequency filtering means when applied to either one or both supply voltage and load current ensure that the electronic circuitry performs the appropriate measurements in determining power consumption. A single sample per mains cycle applied to load current and supply voltage is sufficient to measure power consumption, energy consumption accumulation, and produce accumulated energy pulses appropriate to measurement of real power, true power and volt-ampere power consumed by the load. Similar multiphase meters apply the fundamental frequency filtering means to each load current and optionally to each supply voltage to extend the method used in single-phase meters. To improve accuracy of the measurements where an analogue to digital converter is used the current signal, and optionally the supply voltage signal, is perturbed by a Quantisation Error Dispersion (Q.E.D.) signal. Various circuits are described to generate the Q.E.D. signal and the essential properties of the signal are defined.
    • 其测量装置仅由电子部件组成的装置测量连接到交流电源的电负载所采取的功率,使得所检测的功率或能量积累与由常规旋转执行的相同的测量一致 光盘机电表。 基频滤波意味着当应用于电源电压和负载电流中的一个或两者时,确保电子电路在确定功耗时进行适当的测量。 应用于负载电流和电源电压的每个电源周期的单个样本足以测量功耗,能量消耗积累,并产生适用于测量实际功率,真实功率和负载消耗的伏安功率的累积能量脉冲。 类似的多相电流表将基频滤波装置应用于每个负载电流,并可选地应用于每个电源电压,以扩展在单相电表中使用的方法。 为了提高使用模数转换器的测量精度,电流信号和可选的电源电压信号被量化误差色散(Q.E.D.)信号扰乱。 描述了各种电路来生成Q.E.D. 信号和信号的基本属性被定义。